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Plan Assets as Percentage of Total Funds (Detail) - Gratuity		Mar. 31, 2015
Funds managed by insurance company (1)
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	100.00%
Funds managed by insurance company (1) | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	52.20%
Funds managed by insurance company (1) | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	29.90%
Funds managed by insurance company (1) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	5.50%
Funds managed by insurance company (1) | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	12.40%
Funds managed by insurance company (2)
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	100.00%
Funds managed by insurance company (2) | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	27.00%
Funds managed by insurance company (2) | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	13.60%
Funds managed by insurance company (2) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	53.70%
Funds managed by insurance company (2) | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds	[1]	5.70%
Funds managed by trust
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds		100.00%
Funds managed by trust | Government Securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds		40.20%
Funds managed by trust | Debenture and bonds
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds		45.10%
Funds managed by trust | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds		0.00%
Funds managed by trust | Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset as percentage of total funds		14.70%
[1] The data pertaining to plan investment assets measured at fair value by level and total at March 31, 2015 are provided separately.

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 5



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (d)(1)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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